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After you have it apart, give it a good clean. And Coat the areas around the core and mem with liquid electrical tape or nail polish, both sides, front and back.
You will need to heatsink the digital vreg chips on each PCB as well as the monitor output chip. And make a gasket(s) to go around the core(s)

Make sure you insulate your pot well.

But think about what your insulation will push up against. To fat, it may just kill that item ie: vmem

Now mount the pot to the card, and if your really lucky. You'll have some POS sli bridge getting in the way

The back of the PCB(s) will get very cold, so you will need to insulate that as well. Or you'll have ice/condensation issues, and then the water will run down the card and into the PCI-e slot. And that's bad

I use two layers, the first layer is just plan closed cell insulation.

2nd layer is the black sticky back insulation, make it over sized to stop air getting in and under the first layer.

One last step, The Motherboard

You will need to insulate around the PCI-e slot with liquid electrical tape or nail polish, front and back.

Rub some vaneline or dielectric gease onto both side of the "gold fingers" that go into the PCI-e slot, and a "small" amount onto the top of the slot itself.

I've moved away from using nail polish for insulating around the board.
Using a conformal coating on both sides, is faster, better and costs alot less.

(For New Zealand members) You can pick up a can at JayCars for about $12NZ, and should do 10+ boards. Which is alot better than the $25NZ each board that nail polish was costing me.

Just take off all the heatsinks etc, tape it out and spray! It's that easy.
I don't cover the vreg's around the socket, I spray over the top and clean it off after (I find this faster) the cleaner is sold right next to the conformal coating (For NZ members shopping at JayCars)

"Woe to you, Oh Earth and Sea, for the Devil sends the
beast with wrath, because he knows the time is short...
Let him who hath understanding reckon the number of the
beast for it is a human number, its number is sixteen hundred megahurtz!

Less insulation but basically the same I'd think. Just insulate in the middle of the socket, around it 1/2 an inch or more and the back of the board behind the socket. I ran a single stage at -31 with only about 3-4 sheets of 1/8 thick insulation around my socket with vaseline around the pins. Neoprene works well, and you can get this stuff called armaflex at the home depot for around $7 a roll good enough for several installations of extreme cooling.